Ecosystem Dynamics Energy Flow and Matter Cycling

Rayani Silva and Michael Cale explore ecosystems, focusing on energy flow and matter cycling. They discuss the components of ecosystems, the food chain, and how matter cycles through different states. The video also covers water pollution, its sources, and methods to assess water quality. The hosts encourage viewers to explore local ecosystems and consider their health.

What are the components of an ecosystem?

• Only living organisms

• Living organisms, organic matter, and abiotic components

• Only nonliving things

• Only organic matter

How does energy primarily flow through an ecosystem?

• Through the water cycle

• Via the food chain

• Via the soil

• Through the air

What initiates the cycling of energy in an ecosystem?

• The wind

• The sun

• The moon

• The ocean

How does matter move through an ecosystem?

• In a single loop

• It does not move

• In a straight line

• Through various pathways and cycles

What percentage of the world's water is fresh and available to humans?

• 10%

• 50%

• 3%

• Less than 1%

What is the difference between terrestrial and aquatic ecosystems?

• Both are water-based

• Both are land-based

• Terrestrial ecosystems are water-based, aquatic are land-based

• Terrestrial ecosystems are land-based, aquatic are water-based

What is point source pollution?

• Pollution that is natural

• Pollution that cannot be traced

• Pollution from a single identifiable source

• Pollution from multiple sources

Which of the following is a method to assess water quality?

• Listening to water sounds

• Visual surveys

• Measuring water temperature only

• Counting fish

Why is dissolved oxygen content important in water testing?

• It makes water taste better

• It is needed for aquatic organisms to breathe

• It prevents water from freezing

• It helps plants grow

What does the presence of E. coli in water indicate?

• Clean water

• Presence of fish

• High levels of oxygen

• Presence of fecal matter